Calculators
Date and time-card maths plus stairs, roofs, miters, ducts, conduit bends, land area, pool volume and cut lists — calculators for the house and the job site.
Date Calculator
Days between dates, business days, and date plus-or-minus — free, in-browser.
Time Card Calculator
Weekly timesheet: clock in/out, breaks, overtime split, and gross pay — in-browser.
Stair Calculator
Stair stringer math: risers, treads, angle, IRC code check + to-scale diagram.
Pool Calculator
Pool volume in gallons or liters, plus chlorine, pH and alkalinity doses.
Conduit Bend Calculator
Offset, saddle and 90° stub marks for EMT — multipliers, shrink and take-up.
Land Area Calculator
Trace a parcel on a map to get acres, sq ft, m² and hectares plus perimeter.
Duct Size Calculator
Ductulator online — CFM to round or rectangular duct size, with a velocity check.
Cut List Optimizer
Nest plywood parts onto sheets with kerf and grain locks — printable layouts.
Miter Angle Calculator
Flat miters, crown compound miter and bevel, and polygon segment angles.
Roof Pitch Calculator
Pitch, degree angle, slope % and rafter length — with overhang, ridge deduction and a to-scale section.
Movie End Time Calculator
When the film really ends — including the 20 minutes of trailers the ticket never mentions.
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